US20030128148A1 - Method and apparatus for controlling alarms in an automobile information system - Google Patents
Method and apparatus for controlling alarms in an automobile information system Download PDFInfo
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- US20030128148A1 US20030128148A1 US10/040,907 US4090702A US2003128148A1 US 20030128148 A1 US20030128148 A1 US 20030128148A1 US 4090702 A US4090702 A US 4090702A US 2003128148 A1 US2003128148 A1 US 2003128148A1
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- operating mode
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- 238000000034 method Methods 0.000 title claims abstract description 24
- 238000001514 detection method Methods 0.000 claims abstract description 66
- 230000004044 response Effects 0.000 claims abstract description 18
- 230000001133 acceleration Effects 0.000 claims description 6
- 238000012544 monitoring process Methods 0.000 claims description 4
- 238000005070 sampling Methods 0.000 claims 2
- 230000000007 visual effect Effects 0.000 description 5
- 230000007423 decrease Effects 0.000 description 4
- 230000002411 adverse Effects 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000010304 firing Methods 0.000 description 2
- 230000003252 repetitive effect Effects 0.000 description 2
- 230000004043 responsiveness Effects 0.000 description 2
- 241000270295 Serpentes Species 0.000 description 1
- 235000019504 cigarettes Nutrition 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000011664 signaling Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
- G01S7/021—Auxiliary means for detecting or identifying radar signals or the like, e.g. radar jamming signals
- G01S7/022—Road traffic radar detectors
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- Engineering & Computer Science (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Radar Systems Or Details Thereof (AREA)
Abstract
Description
- The present invention is generally related to radar detection devices. More specifically, the present invention is related to reducing the occurrence of unnecessary alarms by providing the ability to disregard detection of a radar signal during selected driving conditions.
- A radar detection device detects various signals having a bandwidth in the X, K, Ka, and laser frequencies. Frequently, radar signals within these bandwidths are transmitted to determine the velocity of a motor vehicle. A motorist utilizing the radar detection device is alerted when the presence of the radar signal is detected.
- The received microwave signal may also have been transmitted to provide the motorist with information concerning an upcoming driving condition, i.e., road construction, traffic condition, emergency condition, etc. The radar detection device is capable of receiving these information signals and alerting the motorist accordingly. The informational signal may have been transmitted from Cobra's Safety Alert® traffic warning system, as well as other informational signaling systems.
- Radar signals are also utilized in some security systems and operating systems, e.g., automatic door openers. It is possible for the radar detection device to detect these radar signals in addition to the radar signals utilized for determining vehicle speed. However, the motorist utilizing the radar detection device is not concerned with detecting radar signals unrelated to determining the speed of a motor vehicle. Such radar signals are considered extraneous by the motorist and have the same significance as a false alarm; even though a radar signal was detected. Repetitive notification of these extraneous radar signals erodes the motorist's confidence in the detection device. This lack of confidence adversely affects the motorist's attention and responsiveness to the alarm.
- Similarly, alarm notification of a radar signal detection during certain driving conditions wherein the motorist is generally not concerned with detecting the radar signal, e.g., stopped or slow moving vehicle; further conditions the motorist to ignore the alarm. Radar signal detection during these particular driving conditions is unimportant to the motorist and is considered irrelevant, similar to the false signal detection. And again, habitually disregarding the alarm during some driving conditions can lull the motorist into ignoring the alarm signal during all driving conditions.
- Repetitive notification of “false” or extraneous radar signals tends to promote the motorist's disinterest in the alarm. The motorist becomes indifferent and grows accustomed to regarding any alarm as a “false” alarm. Inevitably, the unwitting motorist fails to heed the warning of the radar detection device during a critical driving condition.
- This invention is directed to solving these and other problems.
- One embodiment of the present invention is directed to a method for alerting a motorist of a motor vehicle of a detection of a radar signal. The method comprises setting a reference threshold limit defining an operating mode. Pulses emanating from an electrical generator operably coupled to the motor vehicle are counted during a predetermined time period. The counted pulses are stored and a moving average of the pulses are calculated over a predetermined time duration. The predetermined time duration includes at least one predetermined time period. The operating mode is determined in response to the calculated moving average and the reference threshold limit.
- A further aspect of the present invention includes utilizing more than one reference threshold limit.
- Yet another embodiment of the present invention is directed to a radar detection device for use with a motor vehicle. The motor vehicle includes an electrical generator capable of supplying power to the radar detection device. The radar detection device comprises a power cord for connecting to a power port of the motor vehicle. A counter being operably connected to the power cord is utilized for counting pulses generated from the electrical generators. The pulses emanate from the electrical generator and are related to the revolutions of the engine which powers these generators. A reference threshold limit defines an operating mode including an enable mode and a disable mode. The operating mode is responsive to the pulses counted on the power cord. A detector detects a radar signal wherein an alarm signal is generated in response to the operating mode and the detector. An alarm, e.g., aural or visual, is transmitted in response to the alarm signal.
- Another further aspect of the present invention includes an accelerometer for determining the velocity of the motor vehicle. The pulse counter verifies the velocity determined through integration of the measured acceleration of the vehicle. The alarm is transmitted in response to detection of the radar signal and the velocity of the motor vehicle.
- An object of the present invention is to eliminate notifying a motorist of radar signal detection during driving conditions wherein the motorist is unconcerned with the presence of a radar signal.
- A further object of the present invention is to enhance a driver's recognition and awareness to the presence of a radar signal by providing a radar detection device having the ability to suppress alarm signals during selected driving conditions.
- Other advantages and aspects of the present invention will become apparent upon reading the following description of the drawings and detailed description of the invention.
- FIG. 1 is a block diagram of one embodiment of the present invention; and,
- FIG. 2 depicts a graphical example of one embodiment of the present invention during operation.
- While this invention is susceptible of embodiments in many different forms, there is shown in the drawings and will herein be described in detail a preferred embodiment of the invention with the understanding that the present disclosure is to be considered as an exemplification of the principles of the invention and is not intended to limit the broad aspect of the invention to the embodiment illustrated.
- Radar detection devices detect various radar signals having a bandwidth in the X, K, Ka, and laser frequencies. The detection device is capable of notifying a motorist of the detection of one of these signals being transmitted at the driver's vehicle. Other radar signals emanate from security systems and operating systems. Radar signals from such systems are considered unimportant to the motorist. Similarly, radar signals detected during selected driving conditions are also considered irrelevant by the motorist. These driving conditions generally include non-moving or slow moving motor vehicles. To fully benefit from the radar detection device, the motorist must be confident in the detector's ability to differentiate and notify the detection of relevant, non-extraneous, radar signals. Providing a radar detector with the ability to emit alarm signals only during selected driving conditions can enhance a motorist's recognition and responsiveness to the alarm.
- The present invention is directed to enhancing the operability of a
radar detection device 10. Real and false alarm signals generated by the detection device are often disregarded by a user because the alarm occurred during a specific driving condition wherein the user is not concerned with alarm notification of radar signal detection. These driving conditions primarily involve the motor vehicle traveling at low speeds. However, the motorist is able to select one or more driving conditions. - Referring to the Figures, specifically FIG. 1, a block diagram depicts one embodiment of the present invention, i.e., a
radar detection device 10 for use with a motor vehicle. The motor vehicle includes an electrical generator capable of supplying power to theradar detection device 10, as well as other devices. Theradar detection device 10 comprises a power cord 12 for connecting to a power port of the motor vehicle. Aprocessor 14 having acounter 16 is operably connected to the power cord 12. Thecounter 16 is capable of counting pulses emanating from the electrical generator. These pulses arising from the electrical generator are related to the motor vehicles's engine and traveling speed. Afirst reference limit 26 defines an operating mode having an enable mode and a disable mode. The operating mode is responsive topulses 24 counted on the power cord 12. Adetector 18 is utilized to detect the presence of a radar signal. An alarm signal is generated in response to the operating mode and thedetector 18. Analarm 28 is responsive to the alarm signal. Thealarm 28 can be displayed aurally, visually, or both. - The
radar detection device 10 is operably connected to a power source of a motor vehicle, preferable a +12V power port, e.g., cigarette lighter. The vehicle's power source is operably connected to an electrical generator, which is connected to the engine of the motor vehicle. The power supplied to the power source includes electrical noise. One source of this noise is the firing of the motor vehicle's spark plugs, which is proportional to the revolutions per minute of the engine. The firing of a spark plug will cause a pulse to appear on the power line 12. Although the pulse frequency is indicative of engine revolutions and the velocity of the vehicle, the motor vehicle's velocity is also dependent on the driving gear and engine size of the vehicle. Nevertheless, monitoring and counting these pulses facilitates determining relevant radar signals. - The motorist selects the
reference threshold limit 26 that defines an enable operating mode and a disable operating mode of thedetection device 10. Preferably, the motorist revs the motor vehicle engine and sets thelimit 26 at the desired pulse frequency. Monitoring apulse frequency 22 relative to thereference threshold limit 26 facilitates determining the detection device's 10 operating mode. Thedetection device 10 monitors the amount of pulses occurring on the power line 12. Preferably, the pulses are counted during atime frame 20 having a duration of one second.Several time frames 20 are stored and utilized to calculate a movingaverage 22 ofpulses 24 occurring on the power line 12. Initially, fivetime frames 20 are used wherein the countedpulses 22 occurring during these time frames are averaged. If the movingaverage 22 of thepulses 24 occurring within the fivetime frames 20 exceeds thelimit 26 set by the user, the vehicle is considered to be traveling at a speed relatively greater than the set limit. If theaverage pulse count 22 remains above the setreference 26, i.e., high, for 5consecutive time frames 20, theradar detector 10 is operating in the enable mode. While in the enable operating mode, any detection of a radar signal will generate analarm 28, e.g., aural and visual, from thedevice 10. Preferably, anindicator 38, e.g., LED, speaker; will steadily activate during the enable operating mode. - If the moving
average 22 ofpulses 24 counted on the power signal does not exceed thepredetermined limit 26, the vehicle is considered to be traveling at a speed relatively less than the set threshold limit. If the movingaverage 22 pulse count remains below the setreference 26, i.e., low, for 5consecutive time frames 20, theradar detector 10 is operating in the disable mode. While operating in the disable mode, any alarm signal generated in response to detection of a radar signal will be suppressed. Although both the aural and visual alarm can be suppressed, it is preferred that only the audio alarm will be silenced and the visual alarm will remain visible. Theindicator 38 will periodically activate, e.g., blink, or chirp; while thedetector 10 is in the disable operating mode. - The
radar detection device 10 continues monitoring thepulses 24 occurring on the power signal and determining the average number ofpulses 22 over the predetermined time period. If the movingaverage 22 transverses the setreference 26 for a predetermined time period, e.g., five seconds, the operating mode will be switched. - Another embodiment of the present invention contemplates utilizing the rate of
change 30 in thepulse count 24 from onetime frame 20 to the next in determining the determining the operating mode of thedetection device 10. The pulse counts 24 are monitored and any significant change, increase or decrease, is utilized to calculate the state of the operating mode. Thepulses 24 are sampled over a predetermined time interval, preferably at a rate of 100 mS over 1 S. The ten samples are stored inmemory 32 and utilized to adjust the duration of the operating mode of thedetection device 10. - Referring to FIG. 2, a
graph 34 exemplifies one operational embodiment of the present invention. Thegraph 34 reflects a series of data points, i.e., dots, representingpulses 22, N, counted on the power line 12 over time, t. Initially, theradar detection device 10 is brought up in the enable operating mode, (smart-mute, SM_E), independent of the velocity of the vehicle being above or below the selectedreference 26, Nref. When theradar detection device 10 is turned on, the operating mode is enabled wherein detection of a radar signal will result in an alarm signal being transmitted, preferably aural, visual, or both. - An initial default of five
time frames 20 are utilized to calculate the movingaverage 22 of countedpulses 24. The movingaverage 22 is depicted by the solid line in thegraph 34. If the movingaverage 22 exceeds the selectedreference 26 for fiveconsecutive time frames 20, the operating mode is enabled and detection of a radar signal results in an alarm signal. If the movingaverage 22 remains below the selectedreference 26 for fiveconsecutive time frames 20, the operating mode is disabled, SM_D, wherein detection of a radar signal does not result in an audible alarm. - Initially, the
graph 34 shows the runningaverage 22 being below the selectedreference limit 26 just prior to theradar detector 10 being turned on. At this point, theradar detector 10 enables detection of a radar signal to generate an alarm signal. During the next fiveconsecutive time frames 20, the runningaverage 22 has remained below thereference amount 26; thus, the operating mode becomes disabled. Any detection of a radar signal will result in the alarm being muted. This is because the motorist desires not to be notified of any radar detections occurring when theaverage pulse count 22 is less than the selectedlimit 26. The time duration utilized forconsecutive time frames 20 during determination of the operating mode can be selected by the user. Next, the relative speed of the motor vehicle compared to theset limit 26 begins to increase and exceed the selected threshold as reflected by the increased amount ofpulses 24 counted and the ramping up of the runningaverage 22. After fiveconsecutive time frames 20 of a runningaverage 22 being above the selectedthreshold 26, the operating mode of theradar detector 10 will again be enabled and detection of any radar signal will result in an alarm, preferably aurally and visually. - Although the occurrence of five
consecutive time frames 20 above or below the selectedreference 26 is required to maintain the operating mode, the rate ofchange 30 of the countedpulses 24 is monitored and can affect the time duration utilized during determination of the operating mode. A significant rate ofchange 30, ΔN, betweenadjacent time frames 20 can decrease the length of time required to change operating modes. Specifically, a considerable acceleration or deceleration of the motor vehicle can decrease the length of time required to enable or disable the operating mode of theradar detection device 10. If thepulse count 24 increases or decreases beyond a predeterminedrate 30, the length of the time duration, Td, is increased, or decreased, accordingly, i.e., a count of atime frame 20 is added or removed from a running total. Essentially, the duration of the time period required for changing the operating modes of theradar detector 10 is shortened. Utilizing the rate ofchange 30 between two adjacent pulse counts 24 will provide for a more responsiveradar detection device 10 as the motor vehicle may soon be exceeding thepredetermined limit 26. In response to the high rate ofchange 30, thedetection device 10 will respond by allowing the operating mode to be enabled or disabled more quickly, if necessary. - For example, if the rate of
change 30, ΔN, is ≧512 pulses betweenconsecutive time frames 20, Td is increased, or decreased, by 2 time frames instead of the usual 1 time frame. It is also understood by the present invention that the rate ofchange 30 can be higher or lower than 512 pulses and that fractions or multiples oftime frames 20 can be added or removed to the time duration in response to the rate change. Thus, when Td reaches 5, the radar detector is enabled; and when Td reaches 0, the radar detector operating mode is disabled. - It is preferable to suspend pulse counting during transmission of the audio alarm. Transmission of the audio alarm can affect the counting of the pulses and adversely affect the determination of the radar detection device's operating mode. An “auto-mute” feature of the radar detection device can be incorporated in this situation. “Auto mute” reduces the decibels of the alarm after a predetermined time has elapsed, preferably to an audio level of approximately 14 dBs lower. This lower volume level will not adversely affect the pulse counting and counting can be resumed if “auto-mute” is utilized.
- The present invention further contemplates the use of an
accelerometer 36 to determine the velocity of the motor vehicle. The velocity of the motor vehicle is determined by the measuring and integrating the vehicle's acceleration. The accuracy of integrated acceleration is certified by verifying it against a derived velocity calculated via the processor/pulse counter method described above. The user can select the level of accuracy required during comparison of the integrated velocity and the pulse derived velocity. The integrated velocity can be adjusted accordingly for later use with thedetector 10. - While the specific embodiment has been illustrated and described, numerous modifications come to mind without significantly departing from the spirit of the invention, and the scope of protection is only limited by the scope of the accompanying claims.
Claims (20)
Priority Applications (1)
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US10/040,907 US6621447B2 (en) | 2002-01-07 | 2002-01-07 | Method and apparatus for controlling alarms in an automobile information system |
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US10/040,907 US6621447B2 (en) | 2002-01-07 | 2002-01-07 | Method and apparatus for controlling alarms in an automobile information system |
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US20030128148A1 true US20030128148A1 (en) | 2003-07-10 |
US6621447B2 US6621447B2 (en) | 2003-09-16 |
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US10/040,907 Expired - Fee Related US6621447B2 (en) | 2002-01-07 | 2002-01-07 | Method and apparatus for controlling alarms in an automobile information system |
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Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20060031482A1 (en) * | 2004-05-25 | 2006-02-09 | Nortel Networks Limited | Connectivity fault notification |
US20090285264A1 (en) * | 2008-05-13 | 2009-11-19 | Carlos Aldana | Method and System for Detection of Long Pulse Bin 5 Radars in the Presence of Greenfield Packets |
US20110140848A1 (en) * | 2007-08-24 | 2011-06-16 | Masahiro Abukawa | Broadcast receiver |
CN102248912A (en) * | 2010-05-19 | 2011-11-23 | 通用汽车环球科技运作有限责任公司 | Door locking system for a motor vehicle |
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US6621447B2 (en) | 2003-09-16 |
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